Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Sean Marshall (actor)
Table title:
Filmography
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Title </th><th colspan=1 rowspan=1 > Role </th><th colspan=1 rowspan=1 > Notes </th></tr>
<tr> <td colspan=1 rowspan=1 > 1973 </td><td colspan=1 rowspan=1 > Kung Fu </td><td colspan=1 rowspan=1 > Abel Lovitt </td><td colspan=1 rowspan=1 > Episode: "The Stone" </td></tr>
<tr> <td colspan=1 rowspan=1 > 1973 </td><td class="highlighted"  colspan=1 rowspan=1 > The Deadly Trackers </td><td colspan=1 rowspan=1 > Kevin Kilpatrick </td><td colspan=1 rowspan=1 > Feature film </td></tr>
<tr> <td colspan=1 rowspan=1 > 1974 </td><td colspan=1 rowspan=1 > Little House on the Prairie </td><td colspan=1 rowspan=1 > Boy </td><td colspan=1 rowspan=1 > Episode: "If I Should Wake Before I Die" </td></tr>
<tr> <td colspan=1 rowspan=1 > 1977 </td><td colspan=1 rowspan=1 > ABC Weekend Specials </td><td colspan=1 rowspan=1 > Joe Willie </td><td colspan=1 rowspan=1 > Episode: "Valentine's Second Chance" </td></tr>
<tr> <td colspan=1 rowspan=1 > 1977 </td><td colspan=1 rowspan=1 > Code R </td><td colspan=1 rowspan=1 > Gary </td><td colspan=1 rowspan=1 > Episode: "The Aliens" </td></tr>
<tr> <td colspan=1 rowspan=1 > 1977–78 </td><td colspan=1 rowspan=1 > The Fitzpatricks </td><td colspan=1 rowspan=1 > Max Fitzpatrick </td><td colspan=1 rowspan=1 > Main cast (13 episodes) </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 1977 </td><td class="highlighted"  colspan=1 rowspan=1 > Pete's Dragon </td><td class="highlighted"  colspan=1 rowspan=1 > Pete </td><td class="highlighted"  colspan=1 rowspan=1 > Feature film </td></tr>
<tr> <td colspan=1 rowspan=1 > 1978 </td><td colspan=1 rowspan=1 > Stickin' Together </td><td colspan=1 rowspan=1 > Michael MacKenzie </td><td colspan=1 rowspan=1 > Television pilot (aka Wonderland Cove) </td></tr>
<tr> <td colspan=1 rowspan=1 > 1978 </td><td class="highlighted"  colspan=1 rowspan=1 > The New Adventures of Heidi </td><td colspan=1 rowspan=1 > Peter </td><td colspan=1 rowspan=1 > Television film </td></tr>
<tr> <td colspan=1 rowspan=1 > 1978 </td><td class="highlighted"  colspan=1 rowspan=1 > The Small One </td><td colspan=1 rowspan=1 > Boy (voice) </td><td class="highlighted"  colspan=1 rowspan=1 > Animated short film </td></tr>
<tr> <td colspan=1 rowspan=1 > 1979 </td><td colspan=1 rowspan=1 > The MacKenzies of Paradise Cove </td><td colspan=1 rowspan=1 > Michael MacKenzie </td><td colspan=1 rowspan=1 > Main cast (6 episodes) </td></tr>
<tr> <td colspan=1 rowspan=1 > 1980 </td><td colspan=1 rowspan=1 > To Race the Wind </td><td colspan=1 rowspan=1 > Wilson </td><td colspan=1 rowspan=1 > Television film </td></tr>
</table>
Question:
How many movies was Marshall in and what is he known for in the year 1977?
Answer:
Sean Marshall acted in The Deadly Trackers, The New Adventures of Heidi, the animated short film The Small One and the 1977 Pete's Dragon as Pete.