I like the NuGalactica template.

Previously on...

Basic intro credit (which could be "A Long Time Ago" over a few shots from the whole sage of a mythological bent,"In A Galaxy Far Far Away" followed by a few shots from the whole saga of a science fiction bent).

Opening coda.

Main opening titles (followed by flashing out of context scenes from the coming episode).

Act 1 leading to a mini cliffhanger, ending with a advert break (eg for part one of TPM it could end with the Jedi being trapped in a room filling with gas).

Then three more longer acts also leading to a mini cliff hanger and a break.

Finally act five also ending on a cliff hanger followed by the end titles and a next week trail.

Gerry Anderson used a similar format in all of his shows and Farscape used to follow much the same line too.