1. Super Janemba vs Goku and Vegeta (Fusion Reborn)
http://www.youtube.com/watch?v=Gow3CKljUSk While Goku was fighting against Pikkon in the other world tournament, a clumsy worker wasn't doing his job properly and he released thousands of spirital waste, which also affected him turning him into a big monster simply known as Janemba. Grand Kai told Goku and Pikkon to find out what's going on and the 2 fighters went to where King Yama was trapped, both of them did their best to break the barrier but to no luck, and then they seen the big monster on top of the checkout station where King Yama was. Goku lured Big Janemba to where Hell was while Pikkon continued to try and free King Yama from the barrier. Eventually Goku realised that the monster was more dangerous than he realised so he powered up to Super Saiyan Level 3 and finished Janemba off... or so he thought! Janemba changed into a more menacing form and even with Goku at Super Saiyan Level 3, he was outmatched and beaten, but luckily enough with the checkout station out of commission and with the dead among the living and the living among the dead, Vegeta came to Goku's rescue but even he was outmatched. The 2 saiyans had to think of a plan to try and stop him, Goku can only think of one way to beat him - the fusion tecnique (the same one Goten and Trunks use to become Gotenks), Vegeta originally refused to do it but eventually agreed to go ahead with it since the whole universe was at stake! At the first attempt of the fusion, it wasn't a great success! The reason being that Vegeta didn't stretch his fingers far enough, but luckily they managed to last the full 30 minutes without getting killed again, and so the second time they tried again but this time it was a success and Gogeta had his eyes set on putting an end to Janemba's reign of terror which he exactly did and the worker returned to normal. Before Vegeta returned to hell he thanked Goku, presumably for making Vegeta see sense about saving the whole universe!