(Tale 426)

Aiming for the prize money, Krillin and Android 18 both enter as contestants in the 25th Tenkaichi Budokai.

(Tale 426)

In the preliminary round, contestants are judged by their scores on a punch machine. Cautioned by Krillin not to break the machine, Android 18 holds back.
Mr. Satan steps up for a demonstration and registers 137 points. Even attempting to pull her punches, Android 18 far surpasses his score with an impressive 774 points. Her score is brushed off as a malfunction on the machine's part, and she tries again with a light tap, registering 203 points and qualifying for the next round.

(Tale 431)

In the middle of the main event, Goku and the team take off to prevent Majin Buu's resurrection.
Android 18 declines to go with them, bluntly saying, "Why should I go? There's no money in it." However, she does express concern for Krillin, advising soon after, "If it gets too dangerous... Bail out."

(Tale 445)

Although Android 18 was meant to face off against Mr. Satan, the match format is changed to a five-person battle royale due to the sudden decrease in competitors.
Jewel invites her out to dinner, to which she responds, "Get bent. You bug me." She then promptly hits him with a powerful kick that sends him flying out of the ring immediately after the match begins.

(Tale 452)

She then sets her sights on Mighty Mask, a strangely powerful competitor, and a fierce fight ensues.

(Tale 453)

Backed into a corner, Mighty Mask transforms into a Super Saiyan, which tips Android 18 off to the fact that her opponent is actually Goten and Trunks.

(Tale 453)

Although she is able to dodge the energy blast fired off by Mighty Mask, she is stunned at its speed and power.

(Tale 453)

She uses a Kienzan to slice at Mighty Mask's disguise, revealing his true identity and getting Goten and Trunks disqualified.

(Tale 453)

Finally, Mr. Satan and Android 18 are now the last two left in the battle royale.
She puts the terrified Mr. Satan in a headlock and offers to make a deal: "I could let you win... Give me 20 million zeni and it's yours."

(Tale 454)

Mr. Satan agrees to her terms, crying out, "I-I'll pay! I'd be glad to pay!"
She later takes a direct hit from Mr. Satan's special technique and is thoroughly unimpressed, telling him, "...This is your killer move?" Still, she holds up her end of the bargain and pretends to be thrown out of the ring, giving him the win.
As Mr. Satan revels in his victory, she is quick to remind him of their deal: "I'll be at your house tomorrow to pick up the money. If I don't get it, you're dead."

(Tale 454)

(Tale 431)

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*All images are from the Japanese version.