Goku and Vegeta die. Krillin fuses with Chazou, Roshi with Yajirobe, Tien with Yamcha, Gohan with Future Trunks, Piccolo with Mr Buu. Give the humans the spotlight.
Ok how about this: everyone above, except for Goku and Vegeta and with the addition of Ox King, go into the rosat. Ox King and Yajirobe want to lose some weight for Upa and Suno's wedding (Korin set them up) and they all decide the rosat is a good way to get in lots of steps in within a day, plus the others can train at the same time. However, after walking for a month, they find out the rosat is home to Moro. They can't leave and because Goku/Vegeta are outside the rosat, they don't sense any ki abnormalities. The crew are on their own.