I can sodding REMEMBER terror of the Zygons from being a sproglet, I could only have been about THREE! My mum stopped me watching for about a year after that. It scared the bollockin pish out of me. Nessie looks a bit tragic these days though :(
The Oriental one is Talons of Weng Chiang or summut. Leala's (ahem) Mint, in it, gorgeous and psychotic in equal measure 
Linked stories....
Yup, following a Sontaran attempt to take over Galifrey (Invasion of Time), some geezer called The White Gaurdian sends the Dr off to find the 6 bits of the Key to Time (can't for the life of me remember why they're all over the place). Tom dumps Leala, picks up Romanadvoratrelundar V1.0 (Mary Tamm), and the next 6 stories are all linked, the silliest being The Pirate Planet (by a Mr D. Adams), which WILL make you belly laugh at times, as will the last scene of the last part of the last story, (script edited by, ahem, a Mr D. Adams)
Boaty's gonna take this as proof of my K9 undergarments, tho why he keeps asking "what pants are you wearing" is anyone's guess.