Wanda and Cosmo walked down the aisle. Wanda and Cosmo watched from the seats. Their earlier forms must have been oblivious to the fact that their future selves (and future godchild) were watching.
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After the wedding, they decided that if they showed themselves to be from the future it might mess up the past. So after the service they slipped away. Cosmo waved his wand and they were back home…
"Hang on? Cosmo waved his wand and we actually got to the right time period?" asked Wanda in disbelief.
"GRRRR" roared the T-Rex.
"Aaaaaaaaaarrrrrrrrgggggggghhhhhhh," yelled Timmy and Wanda, running (or flying) in all directions.
"Yay! Snowball!" cried Cosmo (whose sight had never been that good).
"Ah well," said Insomniac II. "No harm done, they'll get out of it like they always do – hey! Watch me hair! This isn't a story you know!"
The end!